Vicky, Camilla. Out of Observing today for squeezing optimization. No SQZ time 16:44UTC to 16:55UTC and 17:01UTC to 17:27UTC. See SQZ Troubleshooting Wiki for instructions.
Can see an increase in SQZ 350-1700Hz BLRMS comparing before and after this optimization.
Last time we re-aligned the pump aom due to clipping was in June, LHO:70198. In summary, I'd expect the power launched to the fiber, "H1:SQZ-SHG_REJECTED_DC_POWERMON", to be ~70% of the SHG output power, "H1:SQZ-SHG_GR_DC_POWERMON".
I added some scopes to the SQZT0 medm screen to make this easier to check, it is in:
--> $userapps/sqz/h1/Templates/ndscope/check_pump_aom_clipping.yaml
or from sitemap > SQZT0 > purple "! SQZT0 scopes" > "check pump aom" from the dropdown list.
From today's scope,
--> with all power going through the AOM (H1:SQZ-OPO_ISS_DRIVEPOINT = 0),
--> it looks like we're only getting ~22 mW out of the pump AOM (sum of bottom 2 traces)
--> when we should be getting 45.8*0.7 ~ 32mW, if the pump aom throughput was normal.
So, if we want to turn up squeeze levels, or if we start to get unstable at this sqz level, we could go into SQZT0 on a Tuesday to check the pump aom + fiber input alignments.
Also adding in a screenshot for how we "Aligned fiber polarization using pico waveplates on SQZT0..," circling the relevant parts of medm screens.
No-sqz times from this work, 1374512130-1374512500.